Automatic focus with variable magnification

Details Automatic focus with variable magnification Automatic focus with variable magnification

1975-04-18

1976-03-23

Borchelt, Archie R.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, 250233, 353101, 355 57, 355 60, G03B 304

Patent

active

039462226

ABSTRACT:
A system for automatically focusing images of different magnifications to be reproduced onto a light sensitive medium. First and second optical patterns of a wavelength to which the light sensitive medium is not responsive are projected from first and second displaced light pattern producing means to the projection plane of the images to be reproduced and back to the light pattern producing means. The light pattern producing means have transparent portions therein such that when the returned optical patterns are defocused portions of the defocused optical patterns are transmitted through the transparent portions. The transmitted light is then mechanically modulated and then converted to an electrical signal which is amplified, filtered and then demodulated to provide a signal having the polarity needed to drive a servo system such that focus of the images to be reproduced is achieved.

REFERENCES:
patent: 3549254 (1970-12-01), Muir
patent: 3709602 (1973-01-01), Satomi
patent: 3721827 (1973-03-01), Reinheimer

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